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Evaluation of Reinforcement Learning-Based Adaptive Modulation in Shallow Sea Acoustic Communication 认领 引用
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作者 Yifan Qiu Xiaoyu Yang +1 位作者 Feng Tong Dongsheng Chen 《哈尔滨工程大学学报（英文版）》 CSCD 2026年第1期292-299,共8页
While reinforcement learning-based underwater acoustic adaptive modulation shows promise for enabling environment-adaptive communication as supported by extensive simulation-based research,its practical performance re... While reinforcement learning-based underwater acoustic adaptive modulation shows promise for enabling environment-adaptive communication as supported by extensive simulation-based research,its practical performance remains underexplored in field investigations.To evaluate the practical applicability of this emerging technique in adverse shallow sea channels,a field experiment was conducted using three communication modes:orthogonal frequency division multiplexing(OFDM),M-ary frequency-shift keying(MFSK),and direct sequence spread spectrum(DSSS)for reinforcement learning-driven adaptive modulation.Specifically,a Q-learning method is used to select the optimal modulation mode according to the channel quality quantified by signal-to-noise ratio,multipath spread length,and Doppler frequency offset.Experimental results demonstrate that the reinforcement learning-based adaptive modulation scheme outperformed fixed threshold detection in terms of total throughput and average bit error rate,surpassing conventional adaptive modulation strategies. 展开更多
关键词 Adaptive modulation Shallow sea underwater acoustic modulation Reinforcement learning
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CSI Feedback-based CS for Underwater Acoustic Adaptive Modulation OFDM System with Channel Prediction 认领 引用 被引量：4
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作者 蒯小燕 孙海信 +4 位作者 齐洁 程恩 许小卡 郭瑜辉 陈友淦 《China Ocean Engineering》 SCIE EI CSCD 2014年第3期391-400,共10页
In this paper, we investigate the performance of adaptive modulation （AM） orthogonal frequency division multiplexing （OFDM） system in underwater acoustic （UWA） communications. The aim is to solve the problem of ... In this paper, we investigate the performance of adaptive modulation （AM） orthogonal frequency division multiplexing （OFDM） system in underwater acoustic （UWA） communications. The aim is to solve the problem of large feedback overhead for channel state information （CSI） in every subcarrier. A novel CSI feedback scheme is proposed based on the theory of compressed sensing （CS）. We propose a feedback from the receiver that only feedback the sparse channel parameters. Additionally, prediction of the channel state is proposed every several symbols to realize the AM in practice. We describe a linear channel prediction algorithm which is used in adaptive transmission. This system has been tested in the real underwater acoustic channel. The linear channel prediction makes the AM transmission techniques more feasible for acoustic channel communications. The simulation and experiment show that significant improvements can be obtained both in bit error rate （BER） and throughput in the AM scheme compared with the fixed Quadrature Phase Shift Keying （QPSK） modulation scheme. Moreover, the performance with standard CS outperforms the Discrete Cosine Transform （DCT） method. 展开更多
关键词 adaptive modulation OFDM CSI feedback compressed sensing channel prediction underwater acoustic channels
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Simultaneous wireless information and power transfer with fixed and adaptive modulation 认领 引用 被引量：1
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作者 Jie Hu Guangming Liang +2 位作者 Qin Yu Kun Yang Xiaofeng Lu 《Digital Communications and Networks》 SCIE CSCD 2022年第3期303-313,共11页
Activating Wireless Power Transfer (WPT) in Radio-Frequency (RF) to provide on-demand energy supply to widely deployed Internet of Everything devices is a key to the next-generation energy self-sustainable 6G network.... Activating Wireless Power Transfer (WPT) in Radio-Frequency (RF) to provide on-demand energy supply to widely deployed Internet of Everything devices is a key to the next-generation energy self-sustainable 6G network. However, Simultaneous Wireless Information and Power Transfer (SWIPT) in the same RF bands is challenging. The majority of previous studies compared SWIPT performance to Gaussian signaling with an infinite alphabet, which is impossible to implement in any realistic communication system. In contrast, we study the SWIPT system in a well-known Nakagami-m wireless fading channel using practical modulation techniques with finite alphabet. The attainable rate-energy-reliability tradeoff and the corresponding rationale are revealed for fixed modulation schemes. Furthermore, an adaptive modulation-based transceiver is provided for further expanding the attainable rate-energy-reliability region based on various SWIPT performances of different modulation schemes. The modulation switching thresholds and transmit power allocation at the SWIPT transmitter and the power splitting ratios at the SWIPT receiver are jointly optimized to maximize the attainable spectrum efficiency of wireless information transfer while satisfying the WPT requirement and the instantaneous and average BER constraints. Numerical results demonstrate the SWIPT performance of various fixed modulation schemes in different fading conditions. The advantage of the adaptive modulation-based SWIPT transceiver is validated. 展开更多
关键词 Simultaneous wireless information and power transfer(SWIPT) Fixed/adaptive modulation Rate-energy-reliability trade-off Transceiver design Energy self-sustainability
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Study of adaptive modulation and LDPC coding in multicarrier systems 认领 引用 被引量：3
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作者 Huo Yongqing Peng Qicong Shao Huaizong 《Journal of Systems Engineering and Electronics》 SCIE EI 2008年第1期39-45,共7页
An adaptive modulation （AM） algorithm is proposed and the application of the adapting algorithm together with low-density parity-check （LDPC） codes in multicarrier systems is investigated. The AM algorithm is base... An adaptive modulation （AM） algorithm is proposed and the application of the adapting algorithm together with low-density parity-check （LDPC） codes in multicarrier systems is investigated. The AM algorithm is based on minimizing the average bit error rate （BER） of systems, the combination of AM algorithm and LDPC codes with different code rates （half and three-fourths） are studied. The proposed AM algorithm with that of Fischer et al is compared. Simulation results show that the performance of the proposed AM algorithm is better than that of the Fischer＇s algorithm. The results also show that application of the proposed AM algorithm together with LDPC codes can greatly improve the performance of multicarrier systems. Results also show that the performance of the proposed algorithm is degraded with an increase in code rate when code length is the same. 展开更多
关键词 multicarrier adaptive modulation low-density parity-check coding bit error rate.
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ADAPTIVE MODULATION AND POWER CONTROL FOR THROUGHPUT ENHANCEMENT IN COGNITIVE RADIOS 认领 引用
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作者 Cheng Shilun Yang Zhen Zhang Hui 《Journal of Electronics(China)》 2008年第1期65-69,共5页
To regulate the transmit-power and enhance the total throughput, a novel Transmit Power Control Game (TPCG) algorithm and an adaptive Modulation TPCG (M-TPCG) algorithm which combine bandwidth allocation, adaptive mod... To regulate the transmit-power and enhance the total throughput, a novel Transmit Power Control Game (TPCG) algorithm and an adaptive Modulation TPCG (M-TPCG) algorithm which combine bandwidth allocation, adaptive modulation and transmit-power control based on Space Time Block Coding (STBC) OFDM-CDMA system are designed and a cross-layer framework of database sharing is proposed. Simulation results show that the TPCG algorithm can regulate their transmitter powers and enhance the total throughput effectively, M-TPCG algorithm can achieve maximal system throughput. The performance of the cognitive radio system is improved obviously. 展开更多
关键词 Cognitive radio Adaptive modulation Cross-layer Power control
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Adaptive Modulation and Coding Based on Fuzzy Logic Cognitive Engine 认领 引用
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作者 张闯 赵洪林 贾敏 《Journal of Donghua University(English Edition)》 EI CAS 2015年第1期30-34,共5页
Adaptive modulation and coding( AMC) which depends on channel state information( CSI) can make the modulation and coding scheme( MCS) for the sender changed, and make the spectrum efficiency enhanced. The traditional ... Adaptive modulation and coding( AMC) which depends on channel state information( CSI) can make the modulation and coding scheme( MCS) for the sender changed, and make the spectrum efficiency enhanced. The traditional method of AMC establishes a lookup table of MCSs at first,and then the sender chooses the proper MCS according to the CSI from feedback channel. However,this method is not suitable for frequency selective and fast fading channel. Thus, a method based on fuzzy logic cognitive engine is proposed in this paper. The type of channel is recognized by the fuzzy logic cognitive engine,then the MCSs are modified to suit for the channel type. The simulation results show that the proposed method is more suitable for frequency selective and fast fading channel. And it is more reliability under the condition of meeting the bit error rate( BER). 展开更多
关键词 adaptive modulation and coding(AMC) channel state information(CSI) modulation and coding scheme(MCS) fuzzy logic
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POWER ALLOCATION AND ADAPTIVE MODULATION STRATEGY FOR MIMO-OFDM SYSTEMS WITH IMPERFECT CSI 认领 引用
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作者 Liu Yi Zhang Hailin 《Journal of Electronics(China)》 2007年第4期443-447,共5页
The presented scheme named M-CAP (Maximum CAPacity) uses the CSI (Channel State Information) and its statistics to deduce an equivalent channel according to which the transmit power is allocated to the subchannels. An... The presented scheme named M-CAP (Maximum CAPacity) uses the CSI (Channel State Information) and its statistics to deduce an equivalent channel according to which the transmit power is allocated to the subchannels. And then modulation scheme is determined adaptively according to the power allocated to each subchannel. The advantage of the M-CAP scheme is that it combines power allocation and adaptive modulation while maintaining a large capacity. We demonstrate by computer simulations that the proposed M-CAP scheme can significantly improve system performance compared with the traditional schemes. 展开更多
关键词 Power allocation Adaptive modulation Multi-Input Multi-Output （MIMO） Orthogonal Frequency Division Multiplexing （OFDM） Singular Value Decomposition （SVD） Channel State Information （CSI）
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LSTM-Based Adaptive Modulation and Coding for Satellite-to-Ground Communications 认领 引用 被引量：3
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作者 Shiqi Zhang Guoxin Yu +2 位作者 Shanping Yu Yanjun Zhang Yu Zhang 《Journal of Beijing Institute of Technology》 EI CAS 2022年第5期473-482,共10页
Satellite communication develops rapidly due to its global coverage and is unrestricted to the ground environment. However, compared with the traditional ground TCP/IP network, a satellite-to-ground link has a more ex... Satellite communication develops rapidly due to its global coverage and is unrestricted to the ground environment. However, compared with the traditional ground TCP/IP network, a satellite-to-ground link has a more extensive round trip time(RTT) and a higher packet loss rate,which takes more time in error recovery and wastes precious channel resources. Forward error correction(FEC) is a coding method that can alleviate bit error and packet loss, but how to achieve high throughput in the dynamic network environment is still a significant challenge. Inspired by the deep learning technique, this paper proposes a signal-to-noise ratio(SNR) based adaptive coding modulation method. This method can maximize channel utilization while ensuring communication quality and is suitable for satellite-to-ground communication scenarios where the channel state changes rapidly. We predict the SNR using the long short-term memory(LSTM) network that considers the past channel status and real-time global weather. Finally, we use the optimal matching rate(OMR) to evaluate the pros and cons of each method quantitatively. Extensive simulation results demonstrate that our proposed LSTM-based method outperforms the state-of-the-art prediction algorithms significantly in mean absolute error(MAE). Moreover, it leads to the least spectrum waste. 展开更多
关键词 satellite communication long short-term memory forward error correction rain loss adaptive modulation and coding
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Adaptive modulation in MIMO optical wireless communication systems 认领 引用 被引量：1
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作者 吴斌 吴亮 邹采荣 《Journal of Southeast University(English Edition)》 EI CAS 2015年第2期175-180,共6页
In the intensity modulation and direct detection （IM/DD） multiple-input multiple-output （MIMO） optical wireless communication systems, a direct-current-biased adaptive modulation scheme is proposed to guarantee th... In the intensity modulation and direct detection （IM/DD） multiple-input multiple-output （MIMO） optical wireless communication systems, a direct-current-biased adaptive modulation scheme is proposed to guarantee the nonnegative property of transmitted signals, and the MIMO channel is converted to a parallel channel by using a singular value decomposition. Besides, a QR decomposition and successive interference cancellation based adaptive modulation scheme is proposed, and the MIMO channel can be simplified to a parallel channel under the bit error ratio （BER） target constraint. The power is optimally allocated to each sub-channel to maximize the data rate. Simulation results show that the proposed adaptive modulation schemes can effectively improve the transmission rate of the systems under the BER target and constant optical power constraints. The proposed adaptive modulation schemes make use of the multiplexing gain of the MIMO techniques, and can further improve the spectrum efficiency of optical wireless systems. 展开更多
关键词 optical wireless communication multiple inputand multiple output （MIMO） adaptive modulation
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Use of Delayed Channel Estimation Results in Adaptive Modulation 认领 引用
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作者 单晓红 王凤英 +1 位作者 郭银景 李瑾 《Journal of Measurement Science and Instrumentation》 CAS 2011年第3期260-263,共4页
In this paper,potential use of perfect but delayed channel estimates for variable-power discrete-rate adaptive modulation is explored.Research is concentrated on block by block adaptation.At first,a new quantity-TAUD(... In this paper,potential use of perfect but delayed channel estimates for variable-power discrete-rate adaptive modulation is explored.Research is concentrated on block by block adaptation.At first,a new quantity-TAUD(Tolerable Average Use Delay)is defined,it quantifies the performance of an adaptation scheme in tolerating the delay of channel estimates.Then,the research on TAUD shows that the delay tolerating performance declines with the increase in average power,the scheme working with more modulation modes can tolerate a longer delay,and such improvement will be more significant with the increase of average power.Finally,it shows that,as the delay tolerating performance determines the maximum block length,it has a great effect on the maximum spectral efficiency.The criterion for determining the block length appropriate for the target BER is described and a simple method of calculating the maximum block length is presented. 展开更多
关键词 delayed channel estimates adaptive modulation block by block adaptation BER maximum block length spectral efficiency
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PERFORMANCES OF ADAPTIVE MODULATION AND CODING IN SATELLITE MOBILE CHANNEL 认领 引用
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作者 Yu Fangyuan Yang Mingchuan Guo Qing 《Journal of Electronics(China)》 2011年第2期181-186,共6页
Given that satellite mobile channel is a time-varying channel,Adaptive Modulation and Coding(AMC) was proposed to provide robust and spectrally efficient transmission over satellite mobile channel.Three different kind... Given that satellite mobile channel is a time-varying channel,Adaptive Modulation and Coding(AMC) was proposed to provide robust and spectrally efficient transmission over satellite mobile channel.Three different kinds of channel environment were considered in this paper:the urban area,the rural area,and the open space.Four combinations of modulation and coding were designed to meet reliable communication on time-varying channel,and spectral efficiency and system throughput of these three kinds of channel environment were simulated.Based on the simulation results,this paper analysed the results and compared the performances of AMC with non-AMC system in these three kinds of channel environment.At last,we come to the conclusions:a system with AMC can achieve higher spectral efficiency and better system throughput;and the spectral efficiency and system throughput of AMC system will be higher on better satellite mobile channel. 展开更多
关键词 Adaptive Modulation and Coding(AMC) Satellite mobile channel Spectral efficiency System throughput
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Adaptive modulation MIMO system based on minimizing transmission power 认领 引用
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作者 WANG Zhi-ying HE Chen 《Journal of Zhejiang University-SCIENCE A》 EI CAS 2006年第6期1046-1050,共5页
Adaptive modulation (AM) is an effective technique to approach the theoretical bound of multi-input and multi-output (MIMO) channel. In most previous studies, the AM parameters were obtained by maximizing the transmis... Adaptive modulation (AM) is an effective technique to approach the theoretical bound of multi-input and multi-output (MIMO) channel. In most previous studies, the AM parameters were obtained by maximizing the transmission rate for a given total transmit power. In this paper, a novel AM-MIMO algorithm is presented, which is based on minimizing total transmit power when the link’s QoS requirements are given. By taking the QoS requirements into account directly, the proposed algorithm not only makes the system more flexible, but also makes the cross layer design of wireless network easier. At last, the numerical results of the proposed scheme are presented. 展开更多
关键词 MIMO system Adaptive modulation （AM） QoS
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MAKING FULL USE OF OUTDATED CHANNEL ESTIMATES FOR BLOCK BY BLOCK ADAPTIVE MODULATIONS 认领 引用
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作者 Shan Xiaohong Bi Guangguo 《Journal of Electronics(China)》 2007年第1期54-59,共6页
This paper explores the potential to use accurate but outdated channel estimates for adaptive modulation. The work is novel in that the research is conditioned on block by block adaptation. First,we define a new quant... This paper explores the potential to use accurate but outdated channel estimates for adaptive modulation. The work is novel in that the research is conditioned on block by block adaptation. First,we define a new quantity,the Tolerable Average Use Delay (TAUD),which can indicate the ability of an adaptation scheme to tolerate the delay of channel estimation results. We find that for the variable-power schemes,TAUD is a constant and dependent on the target Bit Error Rate (BER),average power and Doppler frequency; while for the constant-power schemes,it depends on the ad-aptation block length as well. At last,we investigate the relation between the delay tolerating per-formance and the spectral efficiency and give the system design criterion. The delay tolerating per-formance is improved at the price of lower data rate. 展开更多
关键词 Adaptive modulation Block by block adaptation Channel estimation Spectral efficiency
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MULTICARRIER DS-CDMA WITH ADAPTIVE MODULATION AND POWER ALLOCATION 认领 引用
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作者 ZhaoYahong ZhangZhongpei WuWeiling 《Journal of Electronics(China)》 2003年第3期177-182,共6页
Adaptive modulation and power allocation is introduced into the multicarrier DS-CDMA system to improve the system performance and bandwidth efficiency. First, the systemdesign appropriate for adaptive modulation and p... Adaptive modulation and power allocation is introduced into the multicarrier DS-CDMA system to improve the system performance and bandwidth efficiency. First, the systemdesign appropriate for adaptive modulation and power allocation is given, then the algorithmof adaptive modulation and power allocation is applied. Simulation results demonstrate greatperformance improvement compared with the fixed modulated one. 展开更多
关键词 Multicarrier DS-CDMA Adaptive modulation and power allocation Optimization
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Cluster Modulation: A Generalized Modulation Scheme Leading to NOMA or Adaptive Modulation 认领 引用
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作者 Jamal S. Rahhal Suliman J. Rahhal 《Journal of Computer and Communications》 2024年第7期12-22,共11页
The need for higher data rate and higher systems capacity leads to several solutions including higher constellation size, spatial multiplexing, adaptive modulation and Non-Orthogonal Multiple Access (NOMA). Adaptive M... The need for higher data rate and higher systems capacity leads to several solutions including higher constellation size, spatial multiplexing, adaptive modulation and Non-Orthogonal Multiple Access (NOMA). Adaptive Modulation makes use of the user’s location from his base station, such that, closer users get bigger constellation size and hence higher data rate. A similar idea of adaptive modulation that makes use of the user’s locations is the NOMA technique. Here the base station transmits composite signals each for a different user at a different distance from the base station. The transmitted signal is formed by summing different user’s constellations with different weights. The closer the users the less average power constellation is used. This will allow the closer user to the base station to distinguish his constellation and others constellation. The far user will only distinguish his constellation and other user’s data will appear as a small interference added to his signal. In this paper, it is shown that the Adaptive modulation and the NOMA are special cases of the more general Cluster Modulation technique. Therefore, a general frame can be set to design both modulation schemes and better understanding is achieved. This leads to designing a multi-level NOMA and/or flexible adaptive modulation with combined channel coding. 展开更多
关键词 Cluster Modulation Adaptive Modulation NOMA
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Wireless Local Area Network Adaptive Modulation and Coding Technology Research 认领 引用
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作者 SUNZeng—you SUNXiao-fan 《电脑知识与技术》 2012年第10期6679-6683,共5页
Expound the existing modulation mode of the present wireless local area network.Directing at the problem that when single modulation method conveys data with high speed in the frequency selective fading channel,the sy... Expound the existing modulation mode of the present wireless local area network.Directing at the problem that when single modulation method conveys data with high speed in the frequency selective fading channel,the system throughput will be declined and the efficiency of the spectrum will be lowered.Put forward the scheme that the OFDM sub-carrier will use differ ent modulation modes after dynamic groups by amplitude frequency response.Simulation results show that the scheme will lower the complexity of the system achievement,and can get a higher spectrum efficiency. 展开更多
关键词 WLAN 802.11a adaptive modulation throughput OFDM
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Miniaturized computational spectrometer enabled by the photoelastic effect with adaptive modulation units selection 认领 引用
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作者 LINJUN ZHAI BAOLEI LIU +5 位作者 MUCHEN ZHU YAO WANG CHAOHAO CHEN ZHAOHUA YANG LAN FU FAN WANG 《Photonics Research》 SCIE EI CAS CSCD 2026年第2期I0035-I0046,共12页
Miniature computational spectrometers,distinguished by their compact size and light weight,have shown great promise for on-chip and portable applications in the fields of healthcare,environmental monitoring,food safet... Miniature computational spectrometers,distinguished by their compact size and light weight,have shown great promise for on-chip and portable applications in the fields of healthcare,environmental monitoring,food safety,and industrial process monitoring.However,the common miniaturization strategies predominantly rely on advanced micronano fabrication and complex material engineering,limiting their scalability and affordability.Here,we present a broadband miniaturized computational spectrometer(ElastoSpec)enabled by the photoelastic effect,featuring easy-to-prepare and configurable implementation with adaptive modulation units selection for optimized spectral reconstruction.A single computational photoelastic spectral filter,with only two polarizers and a plastic sheet,is designed to be integrated onto the top of a CMOS sensor for snapshot spectral acquisition.The distinct spectral modulation units are directly generated from different spatial locations of the filter,due to the photoelastic-induced chromatic polarization effect of the plastic sheet.We experimentally demonstrate that ElastoSpec offers excellent reconstruction accuracy for the measurement of both simple narrowband and complex spectra.ElastoSpec exhibits a spectral resolution of 2 nm and achieves a full width at half maximum(FWHM)error of approximately 0.2 nm for monochromatic inputs.It also maintains a mean squared error(MSE)value on the order of 10-3 with only 10 spectral modulation units.Furthermore,we develop an adaptive strategy for selecting modulation units to enhance spectrum sensing performance through the flexibility in optimizing the modulation effectiveness and the number of spectral modulation units.This work avoids the need for complex micro-nano fabrication and specialized materials for the design of computational spectrometers,thus paving the way for the development of simple,cost-effective,and scalable solutions for on-chip and portable spectral sensing devices. 展开更多
关键词 photoelastic effect spectral reconstruction complex material engineeringlimiting advanced micronano fabrication miniaturization strategies broadband miniaturized computational spectrometer elastospec enabl adaptive modulation units miniaturized computational spectrometer
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LLM4AMC:Adapting Large Language Models for Adaptive Modulation and Coding 认领 引用 被引量：1
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作者 Xinyu Pan Boxun Liu +1 位作者 Xiang Cheng Chen Chen 《Journal of Communications and Information Networks》 EI CSCD 2025年第4期352-363,共12页
Adaptive modulation and coding(AMC)is a key technology in 5G new radio(NR),enabling dynamic link adaptation by balancing transmission efficiency and reliability based on channel conditions.However,traditional methods ... Adaptive modulation and coding(AMC)is a key technology in 5G new radio(NR),enabling dynamic link adaptation by balancing transmission efficiency and reliability based on channel conditions.However,traditional methods often suffer from performance degradation due to the aging issues of channel quality indicator(CQI).Recently,the emerging capabilities of large language models(LLMs)in contextual understanding and temporal modeling naturally align with the dynamic channel adaptation requirements of AMC technology.Leveraging pretrained LLMs,we propose a channel quality prediction method empowered by LLMs to optimize AMC,termed LLM4AMC.We freeze most parameters of the LLM and fine-tune it to fully utilize the knowledge acquired during pretraining while better adapting it to the AMC task.We design a network architecture composed of four modules,a preprocessing layer,an embedding layer,a backbone network,and an output layer,effectively capturing the time-varying characteristics of channel quality to achieve accurate predictions of future channel conditions.Simulation experiments demonstrate that our proposed method significantly improves link performance and exhibits potential for practical deployment. 展开更多
关键词 adaptive modulation and coding(AMC) large language models(LLMs) fine-tuning
Adaptive phosphorus modulation tailoring hydroxyl intermediate adsorption for ultrafast water splitting 认领 引用
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作者 Jialin Zhang Liang Zhang +5 位作者 Chao Meng Lei Zhao Deyu Kong Jianglong Ji Xuemin Chen Yue Zhou 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第10期438-447,共10页
Addressing inadequate OH*adsorption in Ru Co alloy catalysts is crucial for boosting intermediate coverage and redirecting the water-splitting pathway.Herein,the adaptive P sites were strategically incorporated to ... Addressing inadequate OH*adsorption in Ru Co alloy catalysts is crucial for boosting intermediate coverage and redirecting the water-splitting pathway.Herein,the adaptive P sites were strategically incorporated to overcome the aforementioned challenge.The P sites,as potent OH*adsorption centers,synergize with Co sites to promote water dissociation and enrich surrounding Ru sites with H*intermediates,thus triggering the Volmer-Tafel route for hydrogen evolution reaction(HER).Besides,during the oxygen evolution reaction(OER),the surface of P-Ru Co was reconstructed into Ru-doped Co OOH with anchored PO43-.These PO43-not only circumvent the intrinsic OH*adsorption limitations of Ru-Co OOH in the adsorbate evolution mechanism(AEM)by rerouting to a more expeditious lattice oxygen oxidation mechanism(LOM)but also improve the coverage of key oxygen-containing intermediates,significantly accelerating OER kinetics.Consequently,the P-Ru Co demonstrates exceptional bifunctional performance,with overpotentials of 29 m V for HER and 222 m V for OER at 10 m A cm-2.Remarkably,the mass activities of PRu Co for HER(5.48 A mg-1)and OER(2.13 A mg-1)are 6.2 and 11.2 times higher than those of its commercial counterparts(Ru/C for HER and RuO2for OER),respectively.When integrated into an anionexchange-membrane electrolyzer,this catalyst achieves ampere-level current densities of 1.32 A cm-2for water electrolysis and 1.23 A cm-2for seawater electrolysis at 2.1 V,with a 500-h durability. 展开更多
关键词 Water splitting Ampere-level current density Adaptive phosphorus modulation Hydroxyl intermediate adsorption RuCo alloy
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A Hybrid Tidal Prediction Scheme Based on Adaptive Modules Adjustment 认领 引用
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作者 WANG Rui YIN Jian-chuan XU Dong-xing 《China Ocean Engineering》 SCIE EI CSCD 2026年第1期144-157,共14页
Due to complex environmental disturbances,high-precision tidal prediction remains a significant challenge in ocean engineering applications.To address tidal variations characterized by nonlinearity,uncertainty,and tim... Due to complex environmental disturbances,high-precision tidal prediction remains a significant challenge in ocean engineering applications.To address tidal variations characterized by nonlinearity,uncertainty,and time-varying dynamics,a hybrid prediction scheme incorporating adaptive module adjustment(AMA)is proposed.The harmonic analysis method is first applied to model tidal effects induced by the movements of celestial bodies.Subsequently,residual components are decomposed using empirical mode decomposition(EMD),with long short-term memory(LSTM)networks and polynomial fitting(PF)employed to construct the tidal prediction model.The decomposition order for LSTM input time series and the selection of polynomial modules are determined adaptively.Finally,the predictions from harmonic analysis and the ensemble model components are combined to generate the final tidal forecast.Experimental simulations are conducted using observed tidal data from gauges at Canaveral Port and Old Port Tampa.Simulation results demonstrate that the proposed adaptive tidal prediction model outperforms conventional methods in terms of prediction accuracy. 展开更多
关键词 tide forecast harmonic analysis empirical mode decomposition(EMD) long short-term memory(LSTM) polynomial fitting(PF) adaptive module adjustment(AMA)
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